fix: fc egg app body parse

[echosoar]

fix: #716

[gitpod-io]

[codecov]

Codecov Report

Merging #719 (0ce46fa) into 2.x (e753359) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              2.x     #719   +/-   ##
=======================================
  Coverage   85.96%   85.97%           
=======================================
  Files         146      146           
  Lines        5807     5810    +3     
  Branches     1006     1009    +3     
=======================================
+ Hits         4992     4995    +3     
  Misses        781      781           
  Partials       34       34           

Impacted Files	Coverage Δ
...es-serverless/serverless-fc-starter/src/runtime.ts	85.12% <100.00%> (+0.37%)	⬆️

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